Every central simple algebra is Hopf Schur

Details Every central simple algebra is Hopf Schur Every central simple algebra is Hopf Schur

2009-12-31

arxiv.org/abs/1001.0157v3

Mathematics

Rings and Algebras

Scientific paper

We show that every central simple algebra A over a field k is Brauer equivalent to a quotient of a finite dimensional Hopf algebra over the same field (that is- A is Hopf Schur). If the characteristic of the field is zero, or if the algebra has a Galois splitting field of degree prime to the characteristic of k, we can take this Hopf algebra to be semisimple. We also show that if F is any finite extension of k, then F is a quotient of a finite dimensional Hopf algebra over k. We use it in order to show why the algebric closeness assumption is necessary in a weak form of Kaplansky's tenth conjecture, due to Stefan

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